High-Dosage Iodine (from Seaweed) May Impair Thyroid Function

Harry Hirsute · � #1 � 08-19-2008, 09:26 PM

Quote:

Suppression of Thyroid Function during Ingestion of Seaweed "Kombu" (Laminaria japonoca) in Normal Japanese Adults.

Miyai K, Tokushige T, Kondo M; Iodine Research Group.

The College of Nutrition, Koshien University.

The effect of ingesting seaweed "Kombu" (Laminaria japonica) on thyroid function was studied in normal Japanese adults.

Ingesting 15 and 30g of Kombu (iodine contents: 35 and 70 mg) daily for a short term (7-10 days) significantly increased serum thyrotropin (TSH) concentrations, exceeding the normal limits in some subjects. The serum free thyroxine (FT4) and/or free 3,5,3'-triiodothyronine (FT3) concentrations were slightly decreased within the normal limits.

During long term daily ingestion of 15g of Kombu (55-87 days), the TSH levels were elevated and sustained while the FT4 and FT3 levels were almost unchanged. Urinary excretion of iodine significantly increased during ingestion of Kombu.

These abnormal values returned to the initial levels 7 to 40 days after discontinuing the ingestion of Kombu.

Based on these findings that thyroid function was suppressed during ingestion of Kombu, though the effect was reversible, we recommend Japanese people avoid ingesting excessive amounts of seaweed.

https://www.docguide.com/news/content..._uids=18689954

Sally B. · � #2 � 08-22-2008, 09:25 AM

Gosh, why exactly were the TSH levels increased? I just bought some Detoxified Iodine made from seaweed. Although, it is recommended to go off of it for two days a week. I'm going to try it. My TSH levels are a tiny bit high, I don't want to take a drug for the rest of my life, not even a natural one. I have used Lugol's and Iosol which didn't seem to make much difference. I guess it will be my own "study."

Sally B.

Harry Hirsute · � #3 � 08-22-2008, 10:00 AM

Sally,

Please report back - whatever you find - success, failure, something in-between.

Your input would be valuable. A study of one can be helpful to many!

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